Back cavity of a golf club head



FIG. 1 is a perspective view from the toe of the back cavity of a golf club head of the present invention;

FIG. 2 is an elevational view thereof; and,

FIG. 3 is a left side view thereof.

The broken lines showing portions of a golf club head in FIGS. 1-3 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a back cavity of a golf club head, as shown and described. 